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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

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HTML 

              
                <div class="credit-card-input">
  <div class="card">
    <div class="face front">
      <div class="card-number">
        0000 0000 0000 0000
      </div>
      <div class="card-holder">
        JOHN L SMITH
      </div>
      <div class="card-date">
        09/24
      </div>
    </div>
    <div class="face back">
      <div class="mag-strip"></div>
      <div class="card-block">
        <div class="card-signature">
          <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 924.727 249.218">
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715,91.715,0,0,0-4.419,10.479,25.116,25.116,0,0,0-1.641,7.575,5.479,5.479,0,0,0,1.641,4.419,6.617,6.617,0,0,0,4.419,1.389q5.05,0,11.11-3.409a86.84,86.84,0,0,0,11.994-8.206,114.88,114.88,0,0,0,10.984-10.1,97.019,97.019,0,0,0,7.828-9.09q1.263-1.263,1.389-.631A3.693,3.693,0,0,1,733.26,155.923ZM892.84,28.663q0,7.828-5.681,18.054T870.494,68.3A230.059,230.059,0,0,1,843.6,91.661a323.037,323.037,0,0,1-36.108,23.356q-7.07,12.877-12.5,23.356t-10.479,22.094q-.505,1.262-.253,1.389t1.01-.631a167.923,167.923,0,0,1,14.9-15.529A66.712,66.712,0,0,1,817.6,133.7a8.014,8.014,0,0,1,2.272-.505,3.561,3.561,0,0,1,3.156,1.768,5.781,5.781,0,0,1,1.136,2.777,18.883,18.883,0,0,1-1.263,4.545q-1.263,3.535-3.283,8.08t-4.419,9.721q-2.4,5.176-4.671,9.721-2.273,4.293-5.3,9.974t-6.312,11.363q-3.283,5.681-6.439,10.857t-5.934,8.964q-10.858,15.15-22.094,24.366a76.238,76.238,0,0,1-23.861,13.509,67.594,67.594,0,0,1-22.22,4.04,57.554,57.554,0,0,1-13.761-1.641,40.686,40.686,0,0,1-12.246-5.176,5.1,5.1,0,0,1-2.146-2.651,24.978,24.978,0,0,1-.631-3.409,23.715,23.715,0,0,0-.253-2.9l-.505-3.788q-.253-1.894-.505-3.661a20.5,20.5,0,0,1-.253-2.525q0-2.272,2.02-1.768a21.712,21.712,0,0,0,1.389,6.818,23.7,23.7,0,0,0,5.05,8.08,29.2,29.2,0,0,0,9.848,6.817q6.186,2.778,15.529,2.778a63.324,63.324,0,0,0,17.927-3.03,50.951,50.951,0,0,0,22.22-13.382,153.464,153.464,0,0,0,18.938-23.482q4.545-6.817,9.09-15.276t8.333-16.539q3.787-8.08,6.439-14.519t3.409-8.964a59.006,59.006,0,0,0,2.273-7.7,23.335,23.335,0,0,0,.505-3.914q0-1.767-1.263-1.768-1.01,0-5.934,3.914a104.327,104.327,0,0,0-10.352,9.6,81.762,81.762,0,0,0-9.721,12.372q-4.292,6.691-4.292,12.5a21.751,21.751,0,0,0,.253,3.535,15.492,15.492,0,0,1,.253,2.02q0,1.263-3.661,2.273a31.223,31.223,0,0,0-7.2,3.03q-1.01,0-1.01-2.02v-4.8a20.486,20.486,0,0,1,.631-4.671,40.235,40.235,0,0,1,2.273-6.439q1.641-3.787,5.176-10.479t9.09-17.17q5.555-10.479,13.887-25.881A214.524,214.524,0,0,1,776.69,128.9a191.748,191.748,0,0,1-25.755,7.575q-2.272,3.787-5.555,9.469t-6.186,11.868a112.771,112.771,0,0,0-4.924,12.246,34.221,34.221,0,0,0-2.02,10.6,14.843,14.843,0,0,0,1.01,6.313q1.01,2.02,4.292,2.02a18.732,18.732,0,0,0,7.2-1.515,91.42,91.42,0,0,0,9.469-4.8.84.84,0,0,1,1.262.126,1.079,1.079,0,0,1,0,1.389q-16.665,10.1-26.765,10.1a9.335,9.335,0,0,1-5.3-1.515q-2.273-1.515-2.273-8.333,0-3.03,2.146-8.459t5.3-11.994q3.156-6.565,6.691-13.509t6.313-13a88.7,88.7,0,0,1-13.13,1.894q-7.827.631-14.14.884-1.01,0-1.01-.758,0-1.515,3.03-1.515,2.777,0,6.818-.126t7.954-.505q3.914-.379,7.323-.884a18.015,18.015,0,0,0,4.419-1.01q2.273-3.535,5.05-7.827t5.555-8.459q2.777-4.166,5.176-7.449a24.921,24.921,0,0,1,3.661-4.293,24.438,24.438,0,0,1,5.934-2.4q3.914-1.136,7.2-2.146,1.263,0,1.01.757a2.433,2.433,0,0,1-1.01,1.263,14.966,14.966,0,0,0-3.914,1.894,12.374,12.374,0,0,0-3.409,3.156q-3.03,3.788-6.944,9.721T752.2,134.207a150.747,150.747,0,0,0,23.1-6.565,195.9,195.9,0,0,0,24.871-11.11q3.535-6.313,7.828-14.393t8.964-16.413q4.671-8.333,9.09-16.16t8.206-13.382a148.086,148.086,0,0,1,11.362-15.15,94.747,94.747,0,0,1,12.5-12.246A64.545,64.545,0,0,1,871,20.583a29.269,29.269,0,0,1,12.5-3.03,13.08,13.08,0,0,1,6.313,1.641q3.03,1.641,3.03,9.216Zm-6.818,2.525a10.3,10.3,0,0,0-1.01-5.05,6.692,6.692,0,0,0-2.651-2.651,10.248,10.248,0,0,0-3.535-1.136,27.709,27.709,0,0,0-3.661-.253,16.04,16.04,0,0,0-5.555,1.262,28.737,28.737,0,0,0-7.827,5.176,102.156,102.156,0,0,0-10.731,11.236,193.057,193.057,0,0,0-14.014,19.442q-2.272,3.788-5.555,9.848t-7.07,13.256q-3.788,7.2-7.828,15.024t-7.828,15.15A259.606,259.606,0,0,0,833.5,97.216a224.445,224.445,0,0,0,25.124-20.074A124.4,124.4,0,0,0,878.2,54.417Q886.022,42.55,886.023,31.188Z" />
          </svg>
        </div>
        <div class="card-cvv">
          000
        </div>
      </div>
    </div>
  </div>
  <form>
    <div class="form-group">
      <label for="cc">Credit Card #</label>
      <input type="text" name="cc" value="" maxlength="16" inputmode="numeric">
    </div>
    <div class="form-group">
      <label for="cvv">CVV</label>
      <input id="cvv" type="text" name="cvv" value="" maxlength="3" inputmode="numeric">
    </div>
  </form>
  <div class="example">
    <h3>Example Card Numbers</h3>
    <dl>
      <div>
        <dt>Visa</dt>
        <dd>4111111111111111</dd>
      </div>
      <div>
        <dt>MasterCard</dt>
        <dd>5555555555554444</dd>
      </div>
      <div>
        <dt>Discover</dt>
        <dd>6011111111111117</dd>
      </div>
      <div>
        <dt>American Express</dt>
        <dd>3411111111111111</dd>
        <dd>3711111111111111</dd>
      </div>
    </dl>
  </div>
</div>
!

CSS 

              
                body {
  background: snow;
  height: 100vh;
  display: grid;
  place-content: center;
  box-sizing: border-box;
  font-family: "IBM Plex Sans", sans-serif;
}

.credit-card-input {
  --cc-type: "Credit Card";
  --cc-color: linear-gradient(
    45deg,
    hsl(0deg 0% 44%) 0%,
    hsl(344deg 0% 49%) 11%,
    hsl(344deg 0% 54%) 22%,
    hsl(344deg 0% 59%) 33%,
    hsl(344deg 0% 65%) 44%,
    hsl(344deg 0% 70%) 56%,
    hsl(344deg 0% 75%) 67%,
    hsl(344deg 0% 81%) 78%,
    hsl(344deg 0% 87%) 89%,
    hsl(0deg 0% 93%) 100%
  );
  margin-inline: auto;
  display: grid;
  place-content: center;
  .card {
    margin-inline: auto;
    aspect-ratio: 16/9;
    height: 250px;
    color: white;
    text-shadow: -1px 2px 3px transparentize(#333, 0.15);
    border-radius: 1rem;
    background-image: var(--cc-color);
    margin-block-end: 1.5rem;
    position: relative;
    transition: 0.5s ease;
    transform-style: preserve-3d;
    box-shadow: 0px 0px 2.7px rgba(0, 0, 0, 0.022),
      0px 0px 6.9px rgba(0, 0, 0, 0.031), 0px 0px 14.2px rgba(0, 0, 0, 0.039),
      0px 0px 29.2px rgba(0, 0, 0, 0.048), 0px 0px 80px rgba(0, 0, 0, 0.07);

    .face {
      display: flex;
      border-radius: 1rem;
      backface-visibility: hidden;
      justify-content: center;
      align-items: center;
      position: absolute;
      width: 100%;
      height: 100%;
    }
    .card-number {
      position: absolute;
      bottom: 90px;
      left: 20px;
      font-size: 1.75rem;
      font-family: "IBM Plex Mono", monospace;
      font-variant-numeric: tabular-nums;
      span:nth-child(4n) {
        margin-inline-end: 1ch;
      }
    }
    .card-holder {
      position: absolute;
      left: 20px;
      bottom: 30px;
      font-size: 1.25rem;
      font-family: "IBM Plex Mono", monospace;
      font-variant-numeric: tabular-nums;
    }
    .card-date {
      position: absolute;
      right: 20px;
      bottom: 30px;
      font-size: 1.25rem;
      font-family: "IBM Plex Mono", monospace;
      font-variant-numeric: tabular-nums;
    }
    .back {
      background: var(--cc-color);
      transform: rotateY(180deg);
    }
    .card-block {
      position: absolute;
      bottom: 80px;
      right: 20px;
      display: flex;
      align-items: center;
      height: 40px;
      background: white;
    }
    .card-signature {
      padding-inline: 1ch;
      height: 100%;
      width: 150px;
      background: #f2fcff;
      overflow: hidden;
      svg {
        fill: #000;
        filter: blur(3px);
      }
    }
    .card-cvv {
      color: black;
      text-shadow: none;
      font-size: 1.25rem;
      width: 3ch;
      padding-inline: 1ch;
      font-family: "IBM Plex Mono", monospace;
      font-variant-numeric: tabular-nums;
      font-style: oblique;
    }
    .mag-strip {
      position: absolute;
      top: 40px;
      background: transparentize(#333, 0.5);
      height: 40px;
      width: 100%;
    }
    &:before {
      content: var(--cc-type);
      font-size: 1.25rem;
      color: white;
      text-shadow: none;
      font-weight: bold;
      position: absolute;
      top: 20px;
      right: 20px;
    }
  }
  form {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1rem;
    .form-group {
      display: flex;
      flex-flow: column;
    }
    input {
      font-size: 1.2rem;
      padding: 1ch;
      border: 1px solid #333;
      border-radius: 0.25rem;
    }
  }
  .example {
    margin-block: 2rem;
  }
  dl {
    display: flex;
    gap: 1rem;
    dt {
      font-weight: bold;
    }
    dd {
      margin: 0;
      font-family: "IBM Plex Mono", monospace;
      font-variant-numeric: tabular-nums;
    }
  }
}

// VISA
.credit-card-input:has(input[name="cc"][value^="4"]) {
  --cc-type: "VISA";
  --cc-color: linear-gradient(
    45deg,
    hsl(234deg 58% 23%) 0%,
    hsl(234deg 57% 26%) 11%,
    hsl(234deg 56% 30%) 22%,
    hsl(234deg 56% 34%) 33%,
    hsl(234deg 55% 38%) 44%,
    hsl(234deg 54% 43%) 56%,
    hsl(234deg 54% 47%) 67%,
    hsl(234deg 56% 51%) 78%,
    hsl(234deg 67% 56%) 89%,
    hsl(234deg 79% 60%) 100%
  );
}

// MasterCard
.credit-card-input:has(input[name="cc"][value^="5"]) {
  --cc-type: "MasterCard";
  --cc-color: linear-gradient(
    45deg,
    hsl(357deg 79% 48%) 0%,
    hsl(359deg 71% 50%) 11%,
    hsl(359deg 70% 53%) 22%,
    hsl(359deg 69% 55%) 33%,
    hsl(359deg 68% 56%) 44%,
    hsl(359deg 67% 58%) 56%,
    hsl(359deg 66% 59%) 67%,
    hsl(358deg 64% 61%) 78%,
    hsl(358deg 62% 62%) 89%,
    hsl(357deg 60% 63%) 100%
  );
}

// Discover
.credit-card-input:has(input[name="cc"][value^="6"]) {
  --cc-type: "Discover";
  --cc-color: linear-gradient(
    45deg,
    hsl(19deg 76% 48%) 0%,
    hsl(18deg 73% 51%) 11%,
    hsl(18deg 75% 53%) 22%,
    hsl(18deg 77% 55%) 33%,
    hsl(18deg 79% 58%) 44%,
    hsl(19deg 81% 60%) 56%,
    hsl(19deg 83% 62%) 67%,
    hsl(19deg 86% 64%) 78%,
    hsl(19deg 89% 66%) 89%,
    hsl(19deg 93% 69%) 100%
  );
}

// American Express
.credit-card-input:has(input[name="cc"][value^="34"]),
.credit-card-input:has(input[name="cc"][value^="37"]) {
  --cc-type: "American Express";
  --cc-color: linear-gradient(
    45deg,
    hsl(212deg 75% 44%) 0%,
    hsl(214deg 61% 49%) 11%,
    hsl(215deg 59% 53%) 22%,
    hsl(215deg 58% 57%) 33%,
    hsl(215deg 58% 61%) 44%,
    hsl(215deg 58% 64%) 56%,
    hsl(214deg 57% 67%) 67%,
    hsl(214deg 56% 71%) 78%,
    hsl(213deg 55% 74%) 89%,
    hsl(213deg 53% 77%) 100%
  );
}

.credit-card-input:has(input[name="cvv"]:focus) {
  .card {
    transform: rotateY(180deg);
  }
}
!

JS 

              
                const ccNumberInput = document.querySelector("input[name='cc']");
const cardNumberDisplay = document.querySelector(".card-number");
const cvvInput = document.querySelector("input[name='cvv']");
const cvvDisplay = document.querySelector(".card-cvv");

ccNumberInput.addEventListener("keyup", (event) => {
  if (event.target.value.length > 16) return;
  ccNumberInput.setAttribute("value", event.target.value);
  cardNumberDisplay.innerHTML = event.target.value
    .trim()
    .split("")
    .map((num) => `<span>${num}</span>`)
    .join("");
});

cvvInput.addEventListener("keyup", (event) => {
  if (event.target.value.length > 3) return;
  cvvDisplay.innerText = event.target.value;
});
!
999px

Console